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OZ9910G

Dual Forward PWM Controller

O2Micro International 

OZ9910

Dual Forward PWM Controller

FEATURES

• Controller for high-voltage DC/DC and

DC/AC converters

• High-efficiency, zero voltage switching dual

forward controller

• Feed forward compensation

• Combined analog and/or PWM control

modes for wide-range load regulation

• Supports wide input voltage range

• Constant operating frequency

• Soft start function

• Built-in open-load protection, over-voltage

protection and over-current protection

• Built-in under-voltage lockout function

• Low stand-by power

• Toggle ENA pin to reset IC

ORDERING INFORMATION

Part Number

OZ9910G

OZ9910GN

OZ9910S

OZ9910SN

OZ9910IS

OZ9910ISN

OZ9910D

OZ9910DN

Temp Range

0oC to 70oC

0oC to 70oC

0oC to 70oC

0oC to 70oC

-40oC to 85oC

-40oC to 85oC

0oC to 70oC

0oC to 70oC

Package

16-pin SOP

16-pin SOP,

Lead-Free

16-pin SSOP

16-pin SSOP,

Lead-Free

16-pin SSOP

16-pin SSOP,

Lead-Free

16-PIN DIP

16-PIN DIP,

Lead-Free

GENERAL DESCRIPTION

The OZ9910 is a high-efficiency pulse-width

modulation (PWM) controller designed for both

DC/DC and DC/AC high voltage applications.

Devices such as magnetrons and traveling wave

tubes (TWT) require a bias voltage up to several

thousand Volts DC and Cold Cathode Fluorescent

Lamp (CCFL) requires several hundred to

thousand Volts AC to operate. The OZ9910, dual

forward PWM controller, is optimized for such

applications

OZ9910 operates in a zero-voltage switch mode

through the dual forward topology utilizing

free-wheeling diodes. The IC operates in a

constant frequency mode that minimizes

electromagnetic interference (EMI). In addition,

OZ9910 achieves a high power-conversion

efficiency resulting in lower power dissipation and

higher system reliability that are critical for radar

transmitters and display systems

OZ9910 supports a wide input voltage range and

provides a constant, user-defined, operating

frequency, ensuring that the load operates at a

fixed frequency. In display systems, a single

operating frequency eliminates interference

among the lamps and the display panel. In radar

systems, a single operating frequency avoids any

influence by alias signals.

The OZ9910 provides a wide-range load

regulation through low-frequency LPWM and/or

analog-adjust dimming controls. It also provides

an option for selecting a different turn-on

frequency from the operation frequency that is

suitable for loads such as CCFL and TWT.

The OZ9910 provides a built-in feed-forward

compensation function for applications requiring a

wider, dynamic input voltage range. The

feed-forward compensation feature optimizes line

and load regulation.

To avoid over-shoot and in-rush current to both

input and output loads during start up, a soft start

function is provided to improve system reliability.

The controller provides open-load protection,

over-voltage protection and over-current

protection. The striking time (turn-on) for

open-load protection is user-defined.

OZ9910 provides under-voltage lockout protection

and will disable the IC if VIN falls below a

threshold. OZ9910 resumes normal operation

when VIN exceeds the threshold.

To reset the IC, toggle the ENA pin. OZ9910

operates with a standby current of approximately

80uA.

12/09/04

Copyright  2004 by O2Micro

OZ9910-DS-1.0

All Rights Reserved

Page 1

CONFIDENTIAL

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